package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1. 校验手机号是否有效
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        // 2. 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 3. 保存验证码
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 4. 发送验证码
        log.debug("发送验证码成功，验证码：{}", code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1. 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        // 2. 校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            log.info("收到的验证码为：{}，查询到的验证码为：{}",code,cacheCode);
            return Result.fail("验证码错误");
        }
        // 3. 查询用户
        User cacheUser = this.query().eq("phone", phone).one();
        if (cacheUser == null) {
            cacheUser = createUserWithPhone(phone);
        }
        // 4. 保存用户
        // 生成token 用户用户携带
        String token = UUID.randomUUID().toString(true);
        // 将user对象转换成hashmap存储
        UserDTO userDTO = BeanUtil.copyProperties(cacheUser, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                // 创建CopyOptions对象，配置Bean转Map时的选项
                CopyOptions.create()
                        // 设置忽略null值字段，不将null值放入map中
                        .setIgnoreNullValue(true)
                        // 设置字段值转换器，将所有字段值统一转换为字符串形式
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // 设置有效期
        stringRedisTemplate.expire(tokenKey, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        return save(user) ? user : null;
    }
}
